I desire to return thanks to many who, from motives of personal friendship or of love for ships, have so readily lent me their assistance in the course of this work. If I have omitted to include the names of any to whom my obligations are due it is from no sense of ingratitude. Especially I am anxious to return thanks to Dr. Wallis Budge and Mr. H. R. Hall of the Egyptian Department of the British Museum, as well as to the officials in other departments of the same institution, particularly those of the Coin Room, the Print Room, the Manuscript Room, Greek and Roman Antiquities, and British and Mediæval Antiquities: to Mr. Clifford Smith of the Victoria and Albert Museum, South Kensington, and to Mr. R. C. Flower of the Public Record Office for assistance in research: to Dr. Hoyle of the Manchester Museum for permission to use photographs of two Egyptian models: to the Board of Education for permission to reproduce photographs of models in the South Kensington Museum: to the Curator of the Royal Naval College Museum, Greenwich, for granting special facilities for studying the collection of models: to the British Consul at Christiania, for assistance in obtaining photographs of Viking ships: to M. Ernest Leroux for permission to use the illustration of the _navis actuaria_ found on the Althiburus mosaic: to the Elder Brethren of Trinity House, jointly with Messrs. Cassell and Co., for allowing me to reproduce Phineas Pett’s _Royal Prince_: to the Committee of the Royal Victoria Yacht Club, Ryde, for permission to reproduce Messrs. West’s photograph of the rare print of the _Alarm_, Fig. 113: to Captain Roald Amundsen for the plans of the _Gjöa_: to the authorities of the British Museum for many illustrations either sketched, photographed, or reproduced from their catalogues: to Lieut.-Colonel A. Leetham, Curator of the Royal United Service Museum, Whitehall, for permission to photograph models and prints: to Captain C. E. Terry for the illustration of the _Santa Maria_: to Mr. A. E. M. Haes for the photograph of the _Oimara_: to Messrs. Camper and Nicholsons, Limited, for the plans of the yacht _Pampas_: to Messrs. White Brothers for the lines of the yacht _Elizabeth_: to Messrs. Fores for the illustrations of the _Xarifa_ and _Kestrel_: and to Mr. H. Warington Smyth for the Nugger in Fig. 8, the two illustrations of Scandinavian and Russian ships in Figs. 30 and 31, and the American schooner in Fig. 91. I wish also to acknowledge Mr. Warington Smyth’s extreme courtesy in offering to allow me to use any of the other sketches in his delightful book “Mast and Sail in Europe and Asia,” and only regret that circumstances prevented my being able to avail myself more fully of so generous an offer.